Structural heterogeneities in starch hydrogels

被引：46

作者：

Koev, Todor T. ^{[1
,2
]}

Munoz-Garcia, Juan C. ^{[1
]}

Iuga, Dinu ^{[3
]}

Khimyak, Yaroslav Z. ^{[1
]}

Warren, Frederick J. ^{[2
]}

机构：

[1] Univ East Anglia, Sch Pharm, Norwich Res Pk, Norwich NR4 7TJ, Norfolk, England

[2] Quadram Inst Biosci, Food Innovat & Hlth, Norwich Res Pk, Norwich NR4 7UQ, Norfolk, England

[3] Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England

来源：

CARBOHYDRATE POLYMERS | 2020年 / 249卷

基金：

英国工程与自然科学研究理事会; 英国生物技术与生命科学研究理事会;

关键词：

Starch hydrogels; NMR spectroscopy; CP/MAS NMR; CPSP/MAS NMR; Network organisation; Internal dynamics; MAS NMR; PHYSICOCHEMICAL PROPERTIES; MOLECULAR ORDER; CEREAL STARCHES; GELATINIZATION; AMYLOSE; RETROGRADATION; COMPONENTS; RHEOLOGY; GRANULE;

D O I：

10.1016/j.carbpol.2020.116834

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Hydrogels have a complex, heterogeneous structure and organisation, making them promising candidates for advanced structural and cosmetics applications. Starch is an attractive material for producing hydrogels due to its low cost and biocompatibility, but the structural dynamics of polymer chains within starch hydrogels are not well understood, limiting their development and utilisation. We employed a range of NMR methodologies (CPSP/MAS, HR-MAS, HPDEC and WPT-CP) to probe the molecular mobility and water dynamics within starch hydrogels featuring a wide range of physical properties. The insights from these methods were related to bulk rheological, thermal (DSC) and crystalline (PXRD) properties. We have reported for the first time the presence of highly dynamic starch chains, behaving as solvated moieties existing in the liquid component of hydrogel systems. We have correlated the chains' degree of structural mobility with macroscopic properties of the bulk systems, providing new insights into the structure-function relationships governing hydrogel assemblies.

引用

页数：11

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